我有两个数据框，如下所示：
a<-c(1,1,-1,1,-1,1)
b<-c(0,200,0,0,0,45)
c<-c(4400,4403,4407,4408,4412,4423)
df1<-cbind(a,b,c)
df1<-as.data.frame(df1)
df1
a b c
1 1 0 4400
2 1 200 4403
3 -1 0 4407
4 1 0 4408
5 -1 0 4412
6 1 45 4423
a<-c(1,1,-1,1,-1,1,-1,1,1,1,1)
b<-c(1,200,1,1,1,45,1,1,30,1,0)
c<-c(3400,3403,3407,3408,3412,3423,3436,3245,3234,3456,2345)
df2<-cbind(a,b,c)
df2<-as.data.frame(df2)
df2
a b c
1 1 1 3400
2 1 200 3403
3 -1 1 3407
4 1 1 3408
5 -1 1 3412
6 1 45 3423
7 -1 1 3436
8 1 1 3245
9 1 30 3234
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